A transformer voltage optimization method based on voltage sensitivity analysis

Abstract

The present application relates to the technical field of power system optimization, in particular to a transformer area voltage optimization method based on voltage sensitivity analysis, comprising: reading the distribution network equipment model and the mapping relationship between the distribution network feeder and the bus, then collecting and analyzing the historical voltage data of each transformer area and the historical voltage data of the bus, calculating the sensitivity of the bus voltage to the transformer area voltage, taking the highest overall voltage qualified rate of the 10kV bus power supply transformer area as the target, based on the sensitivity of the bus voltage to the transformer area voltage, calculating the 10kV bus optimization voltage according to the voltage distribution of the bus power supply transformer area; the present application calculates the sensitivity of the bus voltage to the transformer area voltage by analyzing the historical voltage data of the bus and the transformer area, thereby determining the optimization target of the 10kV bus voltage of the power transmission network; the method aims to realize the accurate and effective regulation of the transformer area voltage of the distribution network, thereby improving the overall level of the transformer area voltage qualified rate of the distribution network, and ultimately promoting the stable and reliable operation of the power system.

Description

Technical Field

[0001] This invention relates to the field of power system optimization technology, specifically a method for optimizing transformer substation voltage based on voltage sensitivity analysis. Background Technology

[0002] Voltage sensitivity is a key parameter in circuit design. The degree to which a circuit is sensitive to voltage changes can determine the stability of the voltage during operation. Currently, with the widespread promotion of new energy sources, a large amount of electricity generated by wind power, photovoltaic power, and hydrogen power is connected to the distribution network, leading to frequent voltage problems on the user side. Traditional dispatchers need to invest a lot of manpower and resources to find the cause of the problem and analyze solutions. As the scale of the distribution network grows larger and more new energy sources are connected, finding solutions to the problem will become increasingly difficult. The voltage problem on the user side urgently needs to be solved.

[0003] Therefore, there is an urgent need for a method for optimizing transformer substation voltage based on voltage sensitivity analysis. Summary of the Invention

[0004] This invention provides a voltage optimization method for distribution transformer areas based on voltage sensitivity analysis. It addresses the problems of limited adjustable capacity of distributed renewable energy in distribution transformer areas and insufficient controlled regulation capacity of residential photovoltaic systems by adopting a transmission and distribution coordination strategy, thereby solving the problems in the background technology.

[0005] The technical solution of this invention is as follows:

[0006] The voltage optimization method for transformer substations based on voltage sensitivity analysis includes the following steps:

[0007] S1: Read the power distribution network equipment model and analyze the topological relationship between the power distribution network area and the feeder;

[0008] S2: Read the mapping relationship between the distribution network feeder and the 10kV bus, and analyze the subordinate relationship between the distribution network area and the 10kV bus;

[0009] S3: Collect historical voltage data of each transformer substation and historical voltage data of the 10kV busbar through the commercial library interface of the D5000 platform;

[0010] S4: Analyze historical voltage data of distribution network areas to determine the distribution of low voltage, high voltage and normal voltage in the areas.

[0011] S5: Analyze historical data of 10kV bus and transformer substation voltage, and calculate the sensitivity of 10kV bus voltage to transformer substation voltage;

[0012] S6: With the goal of achieving the highest overall voltage qualification rate for the 10kV bus power supply area, the optimal voltage for the 10kV bus is calculated based on the sensitivity of the bus voltage to the voltage of the distribution area, taking into account the voltage distribution of the bus power supply area.

[0013] Furthermore, in S1, the topological relationship analysis steps between the distribution network area and the feeder are as follows:

[0014] S1.1: Read the distribution network model file through the D5000 platform interface; where D5000 platform refers to the smart grid dispatch control system, which is applied to dispatch centers at all levels of the State Grid. It is currently the widely used power grid dispatch control system of the State Grid, and has been running in dispatch centers across the country, with more than 5,000 access sites and 700,000 data collection points.

[0015] S1.2: Parse the distribution network model file and generate the topological relationship between the distribution network area and the feeder based on the topology of the equipment nodes in the model.

[0016] Furthermore, in S2, the steps for analyzing the subordinate relationship between the distribution network area and the 10kV bus are as follows:

[0017] S2.1: Read the power transmission network model file through the D5000 platform interface;

[0018] S2.2: Parse the power transmission network model file, generate the topological relationship between the 10kV bus and feeder based on the equipment node topology in the model, and generate the subordinate relationship between the distribution network area and the 10kV bus based on the topological relationship between the distribution network area and the feeder.

[0019] Furthermore, in S3, the specific steps for determining the voltage distribution in the transformer substation include:

[0020] S3.1: Based on the subordinate relationship between the distribution network area and the 10kV bus, analyze the historical voltage data of the distribution network area under the 10kV bus;

[0021] S3.2: Based on the upper limit of voltage (10.7kV) and lower limit of voltage (9.7kV) of the distribution network area, calculate the number of areas with high voltage, low voltage and normal voltage in the area, and statistically analyze the voltage distribution of the area under the bus.

[0022] Furthermore, in S5, the steps for calculating the sensitivity of the 10kV bus voltage to the transformer substation voltage are as follows:

[0023] S5.1: Based on the historical voltage data of the distribution network area analyzed in S4;

[0024] S5.2: Calculate the change in bus voltage between adjacent historical data points;

[0025] S5.3: Calculate the voltage change of distribution network areas in historical data at adjacent time points;

[0026] S5.4: Calculate the sensitivity of the 10kV bus voltage to the voltage change in the distribution network area at different times based on the ratio of the voltage change in the distribution network area to the voltage change in the bus.

[0027] Furthermore, in S6, the optimization steps for the 10kV bus voltage are as follows:

[0028] S6.1: Analyze the voltage situation of the transformer area. If the number of high voltages in the transformer area is greater than zero, jump to S2 for re-analysis. If the number of low voltages in the transformer area is greater than zero, jump to S3 for re-analysis. Otherwise, jump to S4 for re-analysis.

[0029] S6.2: For high voltage situations in the transformer substation area under the bus, a bus voltage adjustment step size is set. By adjusting the bus voltage, the voltage in the substation area is calculated based on the sensitivity of the bus voltage to the transformer substation voltage. The target voltage for the optimized bus voltage is calculated iteratively. The specific steps include:

[0030] S6.2.1: Calculate the current bus voltage qualification rate;

[0031] S6.2.2: Set the bus voltage to the current bus voltage, and then subtract the voltage adjustment step size; adjust the step size according to different voltage levels. For example, for 500kV and above voltage level power grids, the step size is generally between 1kV and 5kV; while for medium and low voltage distribution networks, such as 10kV and 35kV, the step size is generally between 0.1kV and 1kV.

[0032] S6.2.3: Calculate the voltage in the transformer substation after adjustment based on the sensitivity of the bus voltage to the substation voltage and the adjustment step size;

[0033] S6.2.4: Calculate the adjusted bus substation voltage qualification rate and compare it with the current bus voltage qualification rate. If the adjusted voltage qualification rate is higher than the current bus voltage qualification rate, repeat S6.2.1; if the adjusted voltage qualification rate is lower than the current bus voltage qualification rate, the current bus voltage is the target voltage for bus optimization, optimization ends, and jump to S4.

[0034] S6.3: For low voltage situations in the transformer substation area, a bus voltage adjustment step size is set. By adjusting the bus voltage, the voltage in the substation area is calculated based on the sensitivity of the bus voltage to the transformer substation voltage. The target voltage for the optimized bus voltage is calculated iteratively. The specific steps include:

[0035] S6.3.1: Calculate the current bus voltage qualification rate;

[0036] S6.3.2: Set the bus voltage to the current bus voltage plus the voltage adjustment step size;

[0037] S6.3.3: Calculate the voltage in the transformer substation after adjustment based on the sensitivity of the bus voltage to the substation voltage and the adjustment step size;

[0038] S6.3.4: Calculate the adjusted bus substation voltage qualification rate and compare it with the current bus voltage qualification rate. If the adjusted voltage qualification rate is higher than the current bus voltage qualification rate, repeat S6.3.1; if the adjusted voltage qualification rate is lower than the current bus voltage qualification rate, the current bus voltage is the target voltage for bus optimization, optimization ends, and jump to S4.

[0039] S6.4: End 10kV bus voltage optimization.

[0040] Compared with the prior art, the present invention has the following beneficial effects:

[0041] 1. This invention, based on the real-time topology of the transmission and distribution networks, accurately calculates the voltage qualification rate of each transformer substation under the bus. Addressing the limited adjustable capacity of distributed renewable energy in the distribution network and the insufficient controlled regulation capacity of residential photovoltaic systems, this method employs a transmission-distribution coordination strategy. By analyzing historical voltage data of the bus and transformer substations, the sensitivity of the bus voltage to the transformer substation voltage is calculated, thereby determining the optimization target for the 10kV bus voltage of the transmission network. This method aims to achieve precise and effective regulation of the voltage in the distribution network transformer substations, thereby improving the overall level of the voltage qualification rate in the distribution network transformer substations and ultimately promoting the stable and reliable operation of the power system. Attached Figure Description

[0042] Figure 1 This is a flowchart of the voltage optimization method for transformer substations according to the present invention;

[0043] Figure 2 This is a flowchart of the bus voltage optimization process in this invention. Detailed Implementation

[0044] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0045] Example:

[0046] This invention provides a method for optimizing transformer substation voltage based on voltage sensitivity analysis, such as... Figures 1-2 As shown, it includes the following steps:

[0047] S1: Read the power distribution network equipment model and analyze the topological relationship between the power distribution network area and the feeder;

[0048] S1.1: Read the distribution network model file through the D5000 platform interface; where D5000 platform refers to the smart grid dispatch control system, which is applied to dispatch centers at all levels of the State Grid. It is currently the widely used power grid dispatch control system of the State Grid, and has been running in dispatch centers across the country, with more than 5,000 access sites and 700,000 data collection points.

[0049] S1.2: Parse the distribution network model file and generate the topological relationship between the distribution network area and the feeder based on the topology of the equipment nodes in the model.

[0050] S2: Read the mapping relationship between the distribution network feeder and the 10kV bus, and analyze the subordinate relationship between the distribution network area and the 10kV bus;

[0051] S2.1: Read the power transmission network model file through the D5000 platform interface;

[0052] S2.2: Parse the power transmission network model file, generate the topological relationship between the 10kV bus and feeder based on the equipment node topology in the model, and generate the subordinate relationship between the distribution network area and the 10kV bus based on the topological relationship between the distribution network area and the feeder.

[0053] S3: Collect historical voltage data of each transformer substation and historical voltage data of the 10kV busbar through the commercial library interface of the D5000 platform;

[0054] S3.1: Based on the subordinate relationship between the distribution network area and the 10kV bus, analyze the historical voltage data of the distribution network area under the 10kV bus;

[0055] S3.2: Based on the upper limit of voltage (10.7kV) and lower limit of voltage (9.7kV) of the distribution network area, calculate the number of areas with high voltage, low voltage and normal voltage in the area, and statistically analyze the voltage distribution of the area under the bus.

[0056] S4: Analyze historical voltage data of distribution network areas to determine the distribution of low voltage, high voltage and normal voltage in the areas.

[0057] S5: Analyze historical data of 10kV bus and transformer substation voltage, and calculate the sensitivity of 10kV bus voltage to transformer substation voltage;

[0058] S5.1: Based on the historical voltage data of the distribution network area analyzed in S4;

[0059] S5.2: Calculate the change in bus voltage between adjacent historical data points;

[0060] S5.3: Calculate the voltage change of distribution network areas in historical data at adjacent time points;

[0061] S5.4: Calculate the sensitivity of the 10kV bus voltage to the voltage change in the distribution network area at different times based on the ratio of the voltage change in the distribution network area to the voltage change in the bus.

[0062] Assuming the bus voltage is from V m1 Change to V m2 The corresponding transformer substation voltage is from V t1 Change to V t2 The sensitivity is:

[0063] S6: With the goal of achieving the highest overall voltage qualification rate for the 10kV bus power supply area, the optimal voltage for the 10kV bus is calculated based on the sensitivity of the bus voltage to the voltage of the distribution area, taking into account the voltage distribution of the bus power supply area.

[0064] S6.1: Analyze the voltage situation of the transformer area. If the number of high voltages in the transformer area is greater than zero, jump to S2 for re-analysis. If the number of low voltages in the transformer area is greater than zero, jump to S3 for re-analysis. Otherwise, jump to S4 for re-analysis.

[0065] S6.2: For high voltage situations in the transformer substation area under the bus, a bus voltage adjustment step size is set. By adjusting the bus voltage, the voltage in the substation area is calculated based on the sensitivity of the bus voltage to the transformer substation voltage. The target voltage for the optimized bus voltage is calculated iteratively. The specific steps include:

[0066] S6.2.1: Calculate the current bus voltage qualification rate. The qualification rate calculation formula is as follows:

[0067]

[0068] In the formula, the range of qualified voltage points is determined based on factors such as the actual power system operation requirements, the rated voltage of the equipment, and the electricity demand of the users. In this example, 96 points are selected for observation.

[0069] S6.2.2: Set the bus voltage to the current bus voltage, and then subtract the voltage adjustment step size; adjust the step size according to different voltage levels. For example, for 500kV and above voltage level power grids, the step size is generally between 1kV and 5kV; while for medium and low voltage distribution networks, such as 10kV and 35kV, the step size is generally between 0.1kV and 1kV.

[0070] S6.2.3: Based on the sensitivity of the bus voltage to the transformer substation voltage and the adjustment step size, calculate the transformer substation voltage after adjustment. The calculation formula is as follows:

[0071] V′ t =V t +S×ΔV m +k+ΔV s

[0072] In the formula, V′ t This represents the adjusted transformer substation voltage, V. t The voltage of the transformer substation before adjustment is represented by ΔV, where S represents the sensitivity of the bus voltage to the transformer substation voltage. m ΔV represents the change in bus voltage, k represents the coefficient corresponding to the adjustment step size, and is a natural number. s Indicates adjustment of step size;

[0073] S6.2.4: Calculate the adjusted bus substation voltage qualification rate. The calculation method is the same as S6.2.1. Compare it with the current bus voltage qualification rate. If the adjusted voltage qualification rate is higher than the current bus voltage qualification rate, repeat S6.2.1. If the adjusted voltage qualification rate is lower than the current bus voltage qualification rate, the current bus voltage is the target voltage for bus optimization. Optimization ends, and jump to S4.

[0074] S6.3: For low voltage situations in the transformer substation area, a bus voltage adjustment step size is set. By adjusting the bus voltage, the voltage in the substation area is calculated based on the sensitivity of the bus voltage to the transformer substation voltage. The target voltage for the optimized bus voltage is calculated iteratively. The specific steps include:

[0075] S6.3.1: Calculate the current bus voltage qualification rate, using the same method as S6.2.1;

[0076] S6.3.2: Set the bus voltage to the current bus voltage plus the voltage adjustment step size;

[0077] S6.3.3: Calculate the voltage in the transformer substation after adjustment based on the sensitivity of the bus voltage to the substation voltage and the adjustment step size;

[0078] S6.3.4: Calculate the adjusted bus substation voltage qualification rate. The calculation method is the same as S6.2.1. Compare it with the current bus voltage qualification rate. If the adjusted voltage qualification rate is higher than the current bus voltage qualification rate, repeat S6.3.1. If the adjusted voltage qualification rate is lower than the current bus voltage qualification rate, the current bus voltage is the target voltage for bus optimization. Optimization ends, and jump to S4.

[0079] S6.4: End 10kV bus voltage optimization.

[0080] The embodiments of the present invention are given for the purposes of illustration and description. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for optimizing transformer substation voltage based on voltage sensitivity analysis, characterized in that, Includes the following steps: S1: Read the power distribution network equipment model and analyze the topological relationship between the power distribution network area and the feeder; S2: Read the mapping relationship between the distribution network feeder and the 10kV bus, and analyze the subordinate relationship between the distribution network area and the 10kV bus; S3: Collect historical voltage data of each transformer substation and historical voltage data of the 10kV busbar through the commercial library interface of the D5000 platform; S4: Analyze historical voltage data of distribution network areas to determine the distribution of low voltage, high voltage and normal voltage in the areas. S5: Analyze historical data of 10kV bus and transformer substation voltage, and calculate the sensitivity of 10kV bus voltage to transformer substation voltage; S6: With the goal of achieving the highest overall voltage qualification rate for the 10kV bus power supply area, the optimal voltage for the 10kV bus is calculated based on the sensitivity of the bus voltage to the voltage of the distribution area, taking into account the voltage distribution of the bus power supply area.

2. The method for optimizing transformer substation voltage based on voltage sensitivity analysis according to claim 1, characterized in that, In S1, the steps for analyzing the topological relationship between distribution network areas and feeders are as follows: S1.1: Read the distribution network model file through the D5000 platform interface; S1.2: Parse the distribution network model file and generate the topological relationship between the distribution network area and the feeder based on the topology of the equipment nodes in the model.

3. The method for optimizing transformer substation voltage based on voltage sensitivity analysis according to claim 2, characterized in that, In S2, the steps for analyzing the subordinate relationship between the distribution network area and the 10kV bus are as follows: S2.1: Read the power transmission network model file through the D5000 platform interface; S2.2: Parse the power transmission network model file, generate the topological relationship between the 10kV bus and feeder based on the equipment node topology in the model, and generate the subordinate relationship between the distribution network area and the 10kV bus based on the topological relationship between the distribution network area and the feeder.

4. The method for optimizing transformer substation voltage based on voltage sensitivity analysis according to claim 3, characterized in that, In S3, the specific steps for determining the voltage distribution in the transformer substation include: S3.1: Based on the subordinate relationship between the distribution network area and the 10kV bus, analyze the historical voltage data of the distribution network area under the 10kV bus; S3.2: Based on the upper limit of voltage (10.7kV) and lower limit of voltage (9.7kV) of the distribution network area, calculate the number of areas with high voltage, low voltage and normal voltage in the area, and statistically analyze the voltage distribution of the area under the bus.

5. The method for optimizing transformer substation voltage based on voltage sensitivity analysis according to claim 4, characterized in that, In S5, the steps for calculating the sensitivity of the 10kV bus voltage to the transformer substation voltage are as follows: S5.1: Based on the historical voltage data of the distribution network area analyzed in S4; S5.2: Calculate the change in bus voltage between adjacent historical data points; S5.3: Calculate the voltage change of distribution network areas in historical data at adjacent time points; S5.4: Calculate the sensitivity of the 10kV bus voltage to the voltage change in the distribution network area at different times based on the ratio of the voltage change in the distribution network area to the voltage change in the bus.

6. The method for optimizing transformer substation voltage based on voltage sensitivity analysis according to claim 5, characterized in that, In S6, the optimization steps for the 10kV bus voltage are as follows: S6.1: Analyze the voltage situation of the transformer area. If the number of high voltages in the transformer area is greater than zero, jump to S2 for re-analysis. If the number of low voltages in the transformer area is greater than zero, jump to S3 for re-analysis. Otherwise, jump to S4 for re-analysis. S6.2: For high voltage situations in the transformer substation area under the bus, a bus voltage adjustment step size is set. By adjusting the bus voltage, the voltage in the substation area is calculated based on the sensitivity of the bus voltage to the transformer substation voltage. The target voltage for the optimized bus voltage is calculated iteratively. The specific steps include: S6.2.1: Calculate the current bus voltage qualification rate; S6.2.2: Set the bus voltage to the current bus voltage, and then subtract the voltage adjustment step size; S6.2.3: Calculate the voltage in the transformer substation after adjustment based on the sensitivity of the bus voltage to the substation voltage and the adjustment step size; S6.2.4: Calculate the adjusted bus substation voltage qualification rate and compare it with the current bus voltage qualification rate. If the adjusted voltage qualification rate is higher than the current bus voltage qualification rate, repeat S6.2.1; if the adjusted voltage qualification rate is lower than the current bus voltage qualification rate, the current bus voltage is the target voltage for bus optimization, optimization ends, and jump to S4. S6.3: For low voltage situations in the transformer substation area, a bus voltage adjustment step size is set. By adjusting the bus voltage, the voltage in the substation area is calculated based on the sensitivity of the bus voltage to the transformer substation voltage. The target voltage for the optimized bus voltage is calculated iteratively. The specific steps include: S6.3.1: Calculate the current bus voltage qualification rate; S6.3.2: Set the bus voltage to the current bus voltage plus the voltage adjustment step size; S6.3.3: Calculate the voltage in the transformer substation after adjustment based on the sensitivity of the bus voltage to the substation voltage and the adjustment step size; S6.3.4: Calculate the adjusted bus substation voltage qualification rate and compare it with the current bus voltage qualification rate. If the adjusted voltage qualification rate is higher than the current bus voltage qualification rate, repeat S6.3.1; if the adjusted voltage qualification rate is lower than the current bus voltage qualification rate, the current bus voltage is the target voltage for bus optimization, optimization ends, and jump to S4. S6.4: End 10kV bus voltage optimization.

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